Proxy global assessment of land degradation |
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| Authors: | Z G Bai D L Dent L Olsson & M E Schaepman |
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| Institution: | ISRIC –World Soil Information, Box 353, 6700 AJ Wageningen, The Netherlands;, Lund University Centre for Sustainability Studies, Box 170, S-22100 Lund, Sweden;, and Wageningen University Centre for Geo-Information, Box 47, 6700 AA Wageningen, The Netherlands |
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| Abstract: | Land degradation is always with us but its causes, extent and severity are contested. We define land degradation as a long-term decline in ecosystem function and productivity, which may be assessed using long-term, remotely sensed normalized difference vegetation index (NDVI) data. Deviation from the norm may serve as a proxy assessment of land degradation and improvement – if other factors that may be responsible are taken into account. These other factors include rainfall effects which may be assessed by rain-use efficiency, calculated from NDVI and rainfall. Results from the analysis of the 23-year Global Inventory Modeling and Mapping Studies (GIMMS) NDVI data indicate declining rain-use efficiency-adjusted NDVI on ca. 24% of the global land area with degrading areas mainly in Africa south of the equator, South-East Asia and south China, north-central Australia, the Pampas and swaths of the Siberian and north American taiga; 1.5 billion people live in these areas. The results are very different from previous assessments which compounded what is happening now with historical land degradation. Economic appraisal can be undertaken when land degradation is expressed in terms of net primary productivity and the resultant data allow statistical comparison with other variables to reveal possible drivers. |
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| Keywords: | Land degradation normalized difference vegetation index net primary productivity rain-use efficiency global relationships |
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